I dont think the changes were ever made to the book. The addendum has everything you will need to change. To build the original 2 tube design, you will use the layout from the book and just check that the part values are the same from the addendum.
If you use the parts list in the WIKI, just add 1 more Power Tube, 1 more 500Ω 5W resistor and 1 more 25uF/50V capacitor to bring the parts list up to the 2 tube model.
Right now, the 40uF Sprague Atoms capacitors are really expensive. I have been using a 30uF F&T in its place.